Sandvik Coromant 5730998 Turning Insert DCMT21.51-UM 1125

Product Description

The SANDVIK COROMANT 5730998 is a solid carbide turning insert in the DCMT style, designed for external turning operations on CNC lathes and turning centers. It carries a TiAlN and AlCr2O3 dual-layer coating applied via PVD process, delivering heat resistance and edge wear protection during continuous and light interrupted cuts. The insert features a 55-degree diamond shape, a 1/4-inch inscribed circle, and a 1/64-inch corner radius, making it well suited for finishing and semi-finishing passes where tight tolerances and surface finish matter. It belongs to the CoroTurn 107 series and is held in place by a screw-clamp system.

This insert is intended for machining steel as the primary workpiece material, with secondary suitability for stainless steel, non-ferrous metals, superalloys, and titanium. The UM chip breaker geometry is optimized for light to medium depth-of-cut applications in these material groups. Typical installations include external longitudinal turning, facing, and profiling operations on CNC turning centers in production and job-shop environments. The neutral hand orientation allows use in standard right-hand toolholders designed for DCMT insert pockets.

Key Features

• Solid carbide substrate with TiAlN and AlCr2O3 PVD coating for elevated heat and wear resistance
• 55-degree diamond insert shape provides a sharp, low-cutting-force geometry suited for profiling
• UM chip breaker geometry optimized for light to medium finishing cuts in steel and multi-material applications
• 1/64-inch corner radius supports tight-tolerance finishing and reduced surface roughness
• Screw-clamp holding method provides secure, repeatable seating in compatible toolholders
• 2 cutting edges per insert, neutral hand orientation

Compatibility

Designed for use in CoroTurn 107 series toolholders and any screw-clamp DCMT-style insert pocket accepting a 1/4-inch inscribed circle insert with a clearance code C and tolerance code M. ISO designation: DCMT 07 02 04-UM 1125.

Installation Notes

Installation is performed by a machinist or tooling technician. Power down the spindle and engage all machine locks before indexing or replacing inserts. Use the correct Torx or hex key for the clamping screw and avoid over-tightening, which can crack the carbide. Verify the insert seats fully and flush in the pocket before resuming cuts, and confirm correct ISO toolholder designation matches the DCMT insert style.